Improving the rate performance of LiCoO2 by Zr doping

Authors
Kim, Seon HyeKim, Chang-Sam
Issue Date
2009-10
Publisher
SPRINGER
Citation
JOURNAL OF ELECTROCERAMICS, v.23, no.2-4, pp.254 - 257
Abstract
Zr-doped LiCoO2 cathode materials for lithium ion batteries were synthesized by an ultrasonic spray pyrolysis method. The synthesized powders with less than 1 mol% Zr had a single phase layered structure while those with 5 mol% Zr had a little secondary phase, Li2ZrO3. The cycle stabilities of Zr-doped and undoped LiCoO2 were compared at various charge-discharge rates. The Zr-doped LiCoO2 showed much improved cycle stability compared to the undoped, especially at a high C-rate of 3C (4.2 mA/cm(2)). To investigate the reasons of the improvement, changes of the lattice parameters and the interatomic distances of Co-Co and Co-O of the doped and the undoped powders were analyzed using XRD and EXAFS. The lattice parameters, a and c, increased in the powders with less than 1 mol% Zr, but decreased in the powder with 5 mol% Zr. On the other hand, the interatomic distances of Co-Co and Co-O did not change with Zr doping. From these results, the improved cycle stability is thought to be due to the expanded inter-slab distance, which enhances Li-ion mobility during charge/discharge processes.
Keywords
LITHIUM-ION BATTERIES; MG; IMPROVEMENT; ELECTRODE; CATHODE; LITHIUM-ION BATTERIES; MG; IMPROVEMENT; ELECTRODE; CATHODE; Lithium ion battery; Zirconium-doping; Rate performance; Slab distance; EXAFS
ISSN
1385-3449
URI
https://pubs.kist.re.kr/handle/201004/132102
DOI
10.1007/s10832-008-9414-5
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KIST Article > 2009
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